MacPup 550 was released by Prit and runtt21 on August 21, 2013. MacPup550 includes the Enlightenment E17 window manager. The EFL libraries version 1.7.5 and E17 version 17.0 where compiled and installed from source.

MP550 is based on Precise Puppy 5.5.0 , An official woof build of puppy Linux that is binary-compatible with Ubuntu Precise packages.

MP550 contains all the apps from Precise Puppy with the addition of Firefox 21.